

export  function guid() {
  return 'xxxxxxxx-xxxx-5xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g,
    function(c) {
      var r = Math.random() * 16 | 0,
        v = c == 'x' ? r : (r & 0x3 | 0x8);
      return v.toString(16);
    });
}


export  function getSerial(){

  if(localStorage.getItem('serial')==null){
    var num =guid();
    localStorage.setItem('serial',num)
  }
  return localStorage.getItem('serial');
}
